Wheelchair propulsion unit



FIG. 1 is a right side elevational view of a wheelchair propulsion unit showing my new design, the broken lines are for illustrative purposes only;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is an enlarged top and left side perspective view thereof;

FIG. 6 is an enlarged bottom and left side perspective view thereof; and

FIG. 7 is a bottom plan view thereof.

The portion of the attachment arm in FIGS. 2, 3, 5 and 6 is shown broken for convenience of illustration. 

The ornamental design for a wheelchair propulsion unit, as shown and described. 